java - getformat for showing week -

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how can set datetimeformat show this: "wed.-sun." "mon.-sun." "mon.-sun." "mon.-sun." "mon.-tue"

datetimeformat dtfdate = datetimeformat.getformat("dd.mm");  if (rt.detalization.equals("date")) {     dtfdate = datetimeformat.getformat("dd.mm"); } if (rt.detalization.equals("week")) {                     dtfdate = datetimeformat.getformat("eee.dd-eee.dd");     //how can show week choisen day sunday wrote before } if (rt.detalization.equals("month")) {     dtfdate = datetimeformat.getformat("mmm"); }

the below code prints 

     datetimeformat format2 = datetimeformat.getformat("e");      string format = format2.format(new date());      system.out.println(format); //prints "mon"

so 

if (rt.detalization.equals("week")) {          datetimeformat format2 = datetimeformat.getformat("e");     string day= format2.format(dtfdate);                        system.out.println(day+"-sun");  }

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